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I have a clean install of macOS High Sierra with APFS Encrypted file partition. During install I checked the "decrypt at login" option, but each have a different password. I now want to change my APFS password but I haven't been abled to:

  • "change password" is greyed out in the Disk Utility for my APFS volume.
  • diskutil apfs changePassphrase ... returned an error saying it can't do it.

Any idea how I can do that?

P.S. I also have FileVault turned on, with the same password as my login (so different from the APFS Encryption).

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You need to list your disks to find the APFS volume disk where you want to change the password:

sudo diskutil apfs list

Now find the UUID of the cryptographic Disk User:

sudo diskutil apfs listUsers <your APFS volume, like: disk1s1>

Finally you can change the APFS volume password:

sudo diskutil apfs changePassphrase <your APFS volume, like: disk1s1> -user <the Disk User cryptographic UUID, like: 12345678-1234-1234-1234567890AB>
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    This answer just saved me a headache with an APFS volume that somehow Disk Utility would not let me change a password for. Perhaps because I created it on an older machine? Just wanted to add that in my case I had to act on the ` Type: Local Open Directory User` UUID and it worked like a charm!
    – Giacomo1968
    Nov 9, 2018 at 3:59

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